I do think [name_f]Violet[/name_f] completes the set better.
[name_f][/name_f]If you want to continue the "-a” ending, maybe [name_f]Freya[/name_f] & [name_f]Olenna[/name_f]?
[name_f][/name_f]If not, maybe [name_f]Freya[/name_f] & [name_f]Jayne[/name_f], [name_f]Freya[/name_f] & [name_f]Heidi[/name_f], or [name_f]Freya[/name_f] & [name_f]Ingrid[/name_f]?